Plant for making tar macadam.



N. TAYLOR. PLANT FOR MAKING TAR MACADAM. APPLICATION men FEB. 16, 1914.

Patented May 11, 1915.

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n1: NORRIS PETERS (20.. PHOTC-LITHQ, WASHINGTON. DY cv N. TAYLOR.

PLANT FOR MAKING TAR MACADAM.

APPLICATION FILED FEB. 16. 1914.

Patented May 11, 1915.

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N. TAYLOR. PLANT FOR MAKING TAR MACADAIVI.

APPLICATION FILED FEB. 16. I914.

Patented May 11, 1915.

3 SHEETS-SHEET 3.

M @M SMWM THE NORRIS PETERS 60., F'HOTG-L!THG.. WASHINGTON. D. C.

NEIL.TAY LOR, F LEEDS, ENGLAND.

PLANT ron MAKING TAR MACADAM.

Application filed February 16, 1914.

, T all whom it may concern:

Be it known that I, NEIL TAYLOR, a subject of the King of Great Britainand Ireland, residing at Leeds, in the county of invented certain newYork, England, have and useful Improvements in Plants for Making TarMacadam, of which the following is a specification.

This invention relates to means for dry-- ing and heating the stones orthe like used in making tar macadam to a clean hot condition and in aneconomical manner, and in combination therewith and subsidiary thereto,an arrangement of cooperating parts particularly when it is desired tohave the plant portable.

The object or objects of this invention is to provide a largeheatingsurface and a long and slow passage of the stones to be heatedand a long passage ,of the flue or heating gases through the heatingapparatus, and so that the gases are not brought into contact with thestones, while the latter meet with a gradually increasing temperature.

The heating apparatus consists of a chamber divided by horizontalpartitions into a number of alternating heating and flue spaces; theflue spaces being connected at the ends by short vertical flues, so asto give an ascending zig-zag passage forthe products of combustion froma furnace. A rotating vertical shaft is passed vertically upward throughsaid heating and flue spaces, and carries a number of scraper armsaround with it in each heating space. Each heating space is connected tothe heating spaces next above and below by passages through theintervening flue spaces said passages being separated, the passage tothe heating space above being situated in advance, (so considered withreference to the direction of rotation of the revolving scraper arms),of the passage to the heating space next below, by an angular distanceapproximately equal to the angular width of said passages.

The invention is illustrated in the accompanying drawings, Figure 1being an outside elevation of the plant as arranged when it is to havethe same portable. Fig. 2 is a plan. Fig. 3 is a vertical section of thedrying and heating portion of the apparatus. Figs. 4 and 5 arehorizontal sec- Specification of Letters Patent.

' arms 2), and are carried Serial No. 818,935.

tions on lines A A and B B respectively of Fig. 3, and Fig. 6 is an endelevation.

. (1 Figs. 1 and 2 is a chute, into which the broken stones or othermaterial to be dried, heated and tarred are fed, and delivered thence tothe bottom drum 6 of a bucket elevator, and from the top drum 0 of theelevator by the chute cl to the top horizontal space Fig. 3 of themiddle or drying chamber (7), as it Will hereinafter be called. Theremainder of said elevator is not shown as such showing seemsunnecessary to a Patented May 11, 1915.

comprehension of the invention. The drying chamber contains a number ofso-called heating spaces g 9 etc., alternating with a number of fluespaces 71. 7L2, etc., the lat ter communicating two andtwo with shortvertical side flues 71 on both sides of the drying chamber, so that theflame and hot products of combustion from the furnace j at the bottombelow the drying chamber, take a zig-zag course as indicated by thearrows, through the drying chamber before finally escaping through thechimney 7c. The drying chamber and the vertical flues z are contained ina single rectangular casing 6, divided vertically into a middleso-called drying chamber and two outer flue chambers. A vertical shaft Zpasses centrally through the drying chamber, and is driven by gearing mfrom the shaft n of the top elevator drum as shown in Fig. 1. Where theshaft Z passes through the flue spaces, it is protected from the hotgases, and the latter are prevented from escaping up the shaft space byflanged cylindrical castings 0. In each of the heatingspaces 9 g ,etc.,ii number of flat Vertical scraper arms 1 s. as to be carried aroundtherewith.

The broken stones and the like falling from the chute d into topmostheating space drop into the spaces between the scraper around, (say forthe sake of illustration, through 337;} degrees,) when they drop througha sector shaped opening out out of the partition plate forming thebottom of this heating space. Then through a flanged sector shapedcasting g if plate Fig. 2, inserted between this partition and thepartition plate next below, so form a as to from the flue space. Onfalling through the passage through the flue space [a next below theheating space 9 but out off 3 and 5, are attached to the shaft Z so ipassage tube 9 the stones drop into the spaces between the revolvingscraper arms p in the second heating space 9 where they are againcarried around through, (say as above) 337-3 degrees, that is a completecircle less the angular width of a passage tube, and drop through thepassage tube Q2 in the next flue space k to the third heating space 9and so on to the bottom of the drying chamber. As the ends of thescraper arms describe a circle, a circular rim plate 7" Fig. 5 is placedon the partition plate to prevent stones accumulating in the corners ofthe rectangular heating space. 7

It will be evident that the arrangement of the sector shaped passage (9in advance, (so considered with reference to the direction of rotationof the scraper arms,) of the passage 9 next below by an angular distanceor pitch approximately equal to the angular width, of said passage, inthe case supposed 22.} degrees, insures a very long or maximum dryingpassage of stones through the drying chamber. As the space between eachadjoining pair of scrapers receives its own quota of stones, the latterare carried through the drying chamber with the same uniformity andregularity as that of delivery by the chute d, or the uniformity andregularity which is requisite for the regular output of a uniformproduct may even be enhanced by the passages of the stones through theapparatus. Also the stones are first heated by the flue gases when thelatter are most cooled, and lastly when they are hottest, which isconducive to economy; while the stones do not at any time come incontact with the flue gases, so that their surfaces remain cleaner andbetter suited to receive and retain the tar. The hot dry stones areswept by the revolving scrapers p in the last heating space 9 into theside chute s Fig. 6, the bottom of which may be perforated to allow theescape of material too fine to be tarred along with the stones.

The chute 8 Figs. 1, 2 and 6 then delivers stones into the lower end ofa long inclined tar trough 2?, containing a worm u and forming a wormconveyer. The melted tar is supplied to the lower end of the trough insufficient quantity to keep the stones as they are delivered, submerged;while the rotation of the worm u mixes them and raises them to the upperend of the trough, the surplus tar draining on the way, the stones beingfinally discharged at the upper end into carts or on to the ground asrequired. The trough 25 may be surrounded over a portion of its lengthby a shorter larger trough 'v, the ends of the space between the twobeing closed steam tight, so that the trough 01 may serve as a steamjacket to keep the tar sufliciently hot to allow the surplus tar todrain back to the lower part of the tarring trough.

The worm u may be made of increasing pitch toward the upper end,so as toallow the stones to remain proportionately longer in contact with thetar.

Where it is desired to have the apparatus portable, the parts aremounted on a frame w carried on wheels 02, the furnace door y beingpreferably at the rear end of the frame. The inclined tarring and mixingtrough t is carried at one side of the frame, and the bucket elevator isplaced in the middle between the two side frames and in front oftheheating and drying apparatus; and the feed chute a is carried fromthe far side frame, all substantially as shown in the drawings. Theouter sides of the side fines are lined with non-conducting material;doors 2 Figs. 3 and t being also provided for sweeping out the fines.The alternate fine and heating sections may be conveniently formed byloose plates 1 Fig. 3 supported by angle iron or other supports fixed tothe inner side of the walls of the drying chamher, so that they can bereadily removed when required. For the same purpose the top 2 of thedrying chamber may be bolted so as to be removable.

Having now particularly described my invention what I claim and desireto secure by Letters Patent is 1. In apparatus for drying, heating andtarring stones for making tar macadam, the combination on a framemounted on wheels of a motor, a supply chute, an elevating conveyer, asecond supply chute, a drying and heating chamber composed of anascending zig-zag flue, and a circular stepwise descending heatingpassage, the horizontal portions of said flue and of said passagealternating with one another, scraper arms in the horizontal portions ofsaid heating passage mounted on a rotating central vertical shaft, aninclined tarring, mixing and elevating trough and connecting mechanismbetween said motor and the elevating conveyer, central vertical shaftand the trough mixer and elevator, and a chute between the bottomhorizontal portion of the heating passage and the lower end of theinclined tarring trough, substantially as set forth.

2. In apparatus for drying, heating and tarring stones for making tarmacadam, the

combination with a drying and heating chamber composed of alternatehorizontal flue and heating sections, of short end verticalflues,passage tubes through the horizontal flue sections a central rotatingvertical shaft, radial scrapers in each heating section carried by saidvertical shaft, and a delivery chute from the bottom heating section, ofan inclined trough, a rotating mixing elevating and discharging wormmounted in said trough and means for heating said chamber and forheating said trough substantially as set forth.

3. In apparatus for drying and heating stones for making tar macadam thecombination in a drying and heating chamber of a number of alternateheating and flue sections formed by horizontal partitions, a zig-zagpassage for the flame and hot gases consisting of said horizontal fluesections and short vertical end flues, a rotating Vertical shaftextending vertically upward through said heating and flue spaces, anumber of revolving scraper arms in each heating space attached to saidvertical rotating shaft, an isolating sleeve and a passage tube thepassage tube in any in each fiue space, flue space being situated inadvance (so considered with respect to the direction of rota tion of therevolving scraperarms) of the passage tube in the next heating spacebelow by an angular distance approximately equal to the angular width,referred to the revolving vertical shaft as center, of said tubepassages, substantially as set forth.

4:. In apparatus for drying and heating stones for making tar macadam,the combination in a drying and heating chamber of alternate horizontalheating and flue sections, a zig-zag passage formed of said horizontalflue sections and short vertical end flues, a rotating vertical shaft, anumber of scraper arms in each of said heating sections attached to saidrotating shaft, an isolating sleeve and a passage tube in each fluesection, a chimney in communication with the topmost horizontal fluesection, a furnace in communication with the bottom horizontal G'opiesof this patent may be obtained for five cents each, by addressing theflue section and a delivery chute from the bottom heating section,substantially as set forth.

5. In apparatus for drying, heating and tarring stones for making tarmacadam the combination on a frame mounted on wheels, of a heating anddrying chamber at the rear, a endless chain elevator, a chute betweenthe top drum of said elevator and the top of the heating and dryingchamber, a supply chute at the receiving end of the bottom drum of theelevator, an inclined tarring mixing and elevating trough supported byone side of said frame, a chute from the bottom of the drying andheating chamber to the lower end of the inclined trough and drivingconnections between the motor and the chain elevator and the rotatingworm of the inclined tarring trough.

6. In combination with means for supplying heated stones an inclinedtrough receiving them at its lower end, a steam jacket surrounding theupper, part of said trough and a worm turning in the latter to carry thestones up toward the top, the pitch of said screw being increased towardthe upper end for the purpose set forth.

In testimony whereof, I have signed my name to this specification in thepresence of two subscribing witnesses.

NEIL TAYLOR.

Witnesses:

J. CLARK JEFFERSON, ERIC SCULLIN.

Commissioner of Patents.

Washington, I). G.

